#include "stl.h"
#include "solution.h"

int main(int argc, char *argv[]){
    string digits[] = {
        "23", "", "2",
    };
    Solution sln;
    for(auto&s:digits){
        print("digits=", s, "\n")
        print("ans:", sln.letterCombinations(s), "\n")
    }
    
    print("\n------ main exit ------\n")
    return 0;
}
